The point is previously we could suppress them if they asked for something outrageous.
Considering that this happened because the Patricians were unhappy about losing their de facto slaves, once we've demonstrated we'll cave now, why wouldn't their next but one quest be to legalise slavery or else civil war?
Not to be too pessimistic, but we basically seem to have reached the fail state of our civ. I agree with all the arguments that DL now is just kicking the can down the road for a future civil war. The reason it still seems like a decent idea is because it A) eases the failure transition, B) Hopefully gives us another couple hundred years to squeeze out as much advancements as we can for the successor state to make use of.
Now if it turns out there's some light at the end of the tunnel for us that'll be great, but it seems unlikely.